Presser-eoot-opening mechanism



W. SHAW.

PRESSER FOOT OPENING MECHANISNI.

APPLICATION FILED DEC. I1. 1911.

1,315,243. Patentedsept. 9,1919.

' equipped with iiNrrEn sTATEs PATENT cierren WALTER siiAW, or DEDHAM,MASSACHUSETTS, `AssieNoia To UNITED SHOE MA- oiriNEaY CORPORATION, orrATERsoN, NEW JERSEY, A conroiaATioN or NEW JERSEY.

.i i Specification of Letters Patent.

rEEssEE-EooT-OPENING MEciiANisivi.

rai-.enten sept. e, isis.

Appnceupn inea Deeember i7, i917. serial No. 207,536.`

To all LU/wm it may concern:

ham, in the county of Noriolkand Stateof ',Massachusetts, have inventedcertain Improvements in Presser-Feet-Opening Mechanisms, of which thefollowing description, in connection with the accompanying drawings, isa specification, like reference characters on the drawings indicatinglikeparts in the several gures.

This invention relates to fastener Yinserting `machines and, moreparticularly, to those elements which guide and clamp the work while itis being fed and maintain it in proper position whenitis at rest. e Theinvention is of particular utilityyin connection with duplex eyeletingmachines which are arranged for corset work and, `although it willbecome obvious that` its field of use is not limited to this particularmachine or class of machines, the problemw will be considered as itarose inconnection with suoli a machine. ,e e e Duplex eyeletingmachines are commonly clamping members on presser feet of the type shownin Letters Patent of the United States No. 1,030,833, .Granted June 25,1912, upon the application of F. A. R-umney. The work is inserted`between these clamping members by sliding it edgewise between them,whether they are used with or Without an intermediate plate such as thatdisclosed in the cofpending application of F. A. Rumney, Serial No.

" 857,760, filed Aug. 20, 1914:; With certain types of work,`however`,notably corsets in which heavy bones have been inserted or corsetshaving no bones, considerable effort required to push the workintoplace.An object of the invention is to provide novel and convenient means forseparating the work guiding and clamping membersto facilitate theinsertion of work.

Various arrangements of presser `ieet have been suggested in which thetwo `clamping members were articulated or otherwisefiiiterconnected soas to be incapable ofmoving independently of each other. 4'This made theopening oil the clamping members a simple matteras retraction of onememberwould cause corresponding movement of the other. Sucharrangements, however, involve the difficulty that an increase inthethickness of one of the two supc-iposedlayersof work .willcause `thetension to be lessened upon theother layer with the result that thefeeding movements imparted to the twopieces of work may not beequal andhence that the eyelets which are set may not be located exactly"opposite toeach other.

`Afeature of the invention relates to an arrangementl of the presserfeet opening mechanism which will avoid such diiiculties while allowingindependent actionof the presser feet as heretofore, thus retaining thewell known advantages of Such action; the .construction and arrangement,as shown, bein gV -such that equal separating movement will beyimpartedtothe presser i'eet regardllessroftheirrelative positions prior to theseparating" movement.

.lnthe illustrated arrangement the presser feet are` `interconnectedwby, a manually position when the tension is" applied, and

whicharealso constructed and arrangedto allowindependent movement of thepresser `feet 1when the flexible member isunder tensionfand to allowconjoint movement of the presser feet regardless of whetheror not y theflexible member is tensioned.

Other features of the invention relate to the` connections between the"tensioning means, here illustrated as a foot treadle, and the presserfeet separating means, `which connections are arranged t0 prevent theunintentional transmission of tension from the treadle to the separatingmeans and which are also provided with means for preventing theseparating means from becoming unduly slackened` under `the action of aspring inserted `in the connections.

In the following specification and the accompanying drawings there isdescribed and illustrated a specific embodiment of the in-` the UnitedStates No. 1,231,201, ,granted June 26, 1917, upon the application of F.A. Rumney.

Fig. 2'is a fragmentary section through ghe work support adjacent tothepresser eet.

The machine is ordinarily supported upon a bench or table and comprisesa main VVframe 12 to which is bolted an auxiliar)T frame 14. In thisframe the hammer levers r16,`only one of which is shown, are pivoted.

The operating tools are supported in a 'bifurcated frame 18 which is.pivoted in -one arm ofthe bell crank 20 .for back and forth and lateralvmovement. V are guided by ithe stud 22 in cooperation with vthe track24. Supported in the frame 18Y and interposedbetween `Athe tools is acombined die plate and punch plate 26 which cooperates with ,the vsets28 `and punches .30. Suitable hammers 32 and 34 are provided for the:operation .of the sets and punches re- `spectively, ,and it will benoted that .the Vhammers 34 are provided with hooks 36 and l46 capable:of back and forth `adjusting movement when y.actuated a lever 48. ,Theoperation of separating these presser feetis accomplished by Ytensioningabord, preferably in the form 7of `a wire cable 50 which is attached .atits ends .toV the presser feet .and which passes overa guiding pulley 52supported .by means of a clamp 4,54 upon the frame 14. This cable valsopasses through 4guides 56 lat' `the rear of the work support 40 and4around the `tensioning pulley 58, which is connected by means of rods60 .and V.62 and a lever 64 to the crank .66 upon the treadle rod 68.The crank ..66 is attached .to an offset ,70 upon the treadle rod -and atreadle 72 of usual or suitable construction is provided. This treadleis connnonly and preferably also utilized for .tripping `the clutchwhich starts the machine in operation and is arranged =to effect thisStripping when .its forward or toe end is depressed. A spring 74 isinterposed :between the .pulley .58 and the .table yl0 while a stop 76upon the rod 60'is arranged to limit the lupward movement of said rodunder tension of the spring 74.

In Fig. 2, the work .is shown as clamped directly A'between the presserfeet 42 and 44 Without the interposition of the `in-tern-iediate plate.The separa-tion of zthese These Y .movements .and presser feetregardless of the action of the manually operated cable tensioningmeans. Afurther advantage Aof applicants novel arrangement lies in thefact that any movement communicated .to one .of the presser feet, as,for example, .by a variation in thethickness of :the work, will not becommunicated through Athe cable 50 to the other presser foot and,therefore, there will be no vtendency .of such inequalities to causerelief in .the wori .clamping ktension exerted by Ithe other presserfoot .upon the work. Because of the large number of `eyelets .to vbeset, this feature becomes of particular importance in corset work sinceit is very .essential that .there be no variation in the feed movementsof the :two halves of the work, if perfect alinement of the eyelets inthe halves is `to be secured. The spring 74 tends to prevent fthetensioning of the Vcable ,50 by ,an unintentional pressure of 9 theoperators foot upon the heel lend of the treadle 72. Such a pressuremight otherwise cause an .undesirable .opening of the presser feet and,therefore, might destroy uniformity of the feeding ei'ect which normallyis practised by the machine. The

stop 7.6 ,upon .the .rod 60 will, it will be seen, prevent the cablefrom becoming unduly slack when the toe end of the treadle 72is'depressed in vtripping the clutch.

Having thus .described the invention, ywhat .is claimed as new anddesired to be secured yby Letters Patent of the -United States is l. Inafastener-inserting machine, coperative Iwork-clamping -members movabletowardand from leach other 4independently vof each other, and means forseparating said members .constructed and arranged to equalize theseparating stresses applied to said members.

In a fastener-inserting machine, coperative work-.clamping membersmovable toward and from .each other, and manually operative meansconnected to said clamping members separately `to retract Leach fromvthe other` said means being arranged to equalize ,the .separatingstresses applied to said members.

3. Ina fastener-inserting machine, cop- ,erative work-clamping :membersmovable toward and from each other, iexible means connected to .each ofvsaid clamping members separately, and means arranged to .operate saidflexible `means to retract said clamping members from each other, saidflexible means and said operating means being arranged to equalize theretracting stresses applied to the clamping members.

4;. In a fastener inserting machine,` du plex fastener insertingmechanisln constructed and arranged to operate upon superposed layers ofWork, Work guiding mechanism, co-acting superposed presser feet, a cordconnecting said presser feet,` and a guiding pulley and an actuatingpulley for said cord constructed and arranged to cause a separatingmovement of said presser feet upon the tensioning of said cord throughmovement of said actuating pulley.

5. In a fastener inserting machine, coperative presser feet constructed"and arranged to clamp superposed layers of Work, means interconnectingsaid presser feet constructed and arranged to permit movement of one ofthe presser feet `indepc-mdently of the other, manually operative meansarranged to actuate the first said means to separate the presser feet,and means tending to prevent unintentional actuation of said manuallyoperative means.

6.' In a fastener inserting machine, presser feet constructed andarranged to clamp superposed layers of work, means interconnecting saidpresser feet constructed and arranged to separate the presser feet,tensioning means for the separating means1 means tending to relieve thetension upon said separating means, and means for preventing saidseparating means from becoming unduly slaclened,

In testimony whereof I have signed my name to this specification.

WALTER SHAW.

Copies f this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, 1).0.

